It is a demonstration of power, like the white Anglo pointing to his helot African American soldiers or sending Asian Americans like Donald Lu to the Middle East on Anglo imperial missions. Tang Dynasty used to do it as well, which is how you got the An Lushan rebellion.I dont think its demonstration of a racial superiority when alot of Africans earn medals for Europe and US. They were basically showing success of cultural integration. because all those medal winners need Coaches and training facilities. Even Algeria got Women Gymnast Gold thanks to French born mix Algerian. Japan and Korea also did well. Those Ex Soviet states except Russia won 17 Golds.